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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d9bd422e108b22c334678b6aeba3c9f655ccf075e7f826cb5b126bd6bb46fc5' 
  AND token = 'kdNrvGPsw8jr+LGT4oY/9re+aFI71/sm8DXb5kyFR84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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