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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b90055485859b6bf668cb0aadaf2bc67367095a80166db8eb90155eb2e46c95d' 
  AND token = 'ByLtj3FN+H4vHXMz2IBjcGnTYtmYv3QRc6Tj/UCPrz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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