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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52e3ca2af5d571bd82893c24d0a9c5bcb8b48da0fdb842742e884815b8a5480e' 
  AND token = 'UkFHejNRuUBzxUfRfkFrGFn25TRzmRCizIR6H53H7PI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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