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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca2efe8ae892ef352a9459a87796b933d17ae112386df11f5fd6d92fa041588a' 
  AND token = 'K+deXdYTNCi1VT6+PPBN4IM+9MUuqBW6W/tafJb9Z3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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