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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56007f4b18449c21656ae644be44d4646f61ab8184824da1fcf294d2ad9d9395' 
  AND token = 'RVGmIeNQn1ecKDW5LYbLHd5XBwPBuY/wrAlenwKuRP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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