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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc5f0b0593a7439bd75b5b7ccd44da074215af81418d6bb7f8185c7a0aef4f1c' 
  AND token = 'N5h5FIA5hQqzU+bcLF42XPGGRtzCckvatSumT24gYoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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