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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5e3103fab98f5c3fb0169cc6fa0917672d4973fc7c3c8e74305c8b8d0662a7d' 
  AND token = 'DUPK6y4a8RXURyL8F8Fnkw77h7RoCyebB/2YjAMzJYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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