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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7ea99c587379db2f6818138eb1eb5fd32ff108e370706c3d5ebe0399b449549' 
  AND token = 'En6eGPW9HgUftE5VXxn5mpmp/mBm+65f2cGdx24PLfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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