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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '035e42bfc170b52fc45f11bb0cf616007516f5cae3b5bb767ced7c16ff4c0e0d' 
  AND token = 'tnG4LMDjmu2JNg0hEKAHJZv7/qeaD4/H3lZkZQEtvus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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