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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '998e59928ccef3bfa60a8fddc6ed34aa9dd3ef9de87dba9f2a8b3881851b675d' 
  AND token = 'KJl+saYY1gFCS6zp38uNGpDEl8qNK0zzqy9dvhwq8lg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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