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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '370674337afeeaa254582c24128fba06e7feb4361c5b981aa3c85a0c0ae539d0' 
  AND token = 'aDPz/B8zUL4L23mJzHg5hu7fLWz5/pDapKM1eVAe/QE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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