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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20e80284decc82863f02e38eb3dd6f632cbe9f63688e2c8bce1707ae3bd612a7' 
  AND token = 'rtOTRb4Ps0cl7oj3GaVCDEuJ/maaDSPGXmKIryfGsBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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