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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c71951674a06f94295657efe8a8704b53301c07ce22edc7c829f382952d47dd' 
  AND token = 'V7/i7Vtsutzy+WnSl/D0DJb3pdxs2s3YsXs0E25OQqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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