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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cba072c1d971014c46d3aa592fb1ad9f4acb55f7d0c8b6c477167bb5ead09cfb' 
  AND token = 'pp75w4YuL/cGhf5BM1HNqUs4izAT61QpVPPI5ghGNl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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