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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c015c4293a4214f9dd343ac007a833c86b35bcb0a633d2338f1e44243df8feab' 
  AND token = 'EvuLz+A7AkX0rOZLWaqhqHLK3bCUAz+FxWQPX1uktkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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