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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94862e5bda6853909c05f894bb496c6489a6089cf4aea798848042bf3e210de9' 
  AND token = 'TprapPT853VQZyO4PKO1JF8RfYR6oaw1p43wRXtCzpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}