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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36ad3753c1c24da766c0f183a007a93c1d03afcf82327115ce5ef331a2420629' 
  AND token = 'ZnkDHjLU3Qcfs5+B5TtRFn5vEm7Ikt9DnqB6Z2cKlzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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