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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb83e46dc5982a75ca88def07e13e5ccd8b7847ba859638b30f45f758d646fe9' 
  AND token = '/eA3H/jEsFF0SSn6eKQjrga1pNHFZCrHSGN0SCkfJ/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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