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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3a4b07989beb759f9a58bf160d0eec5ed0c8c738d04bdb46e763621ef9ccff2' 
  AND token = 'LKfPfqNJO9H3B9Fhpuwm1N5R9Qa7/8sbcqY2948q0J0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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