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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3ab46cfc910515094974fd1bbea8fb591fabc961199ce582ad408e569475632' 
  AND token = 'PEVp+IFVcE/6bk5Y+mR0lZNyQLofTxlSKU+LDS2zx1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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