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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7907b66bc38954bbeeb01a6dbbe6a872f8bd4f9b4c37cfcf2405df8338b667ed' 
  AND token = '6P1vdHiIgc7AIdNlAy0J/TZbhoeeWvW/qB1j0oYgY/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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