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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '734c13f0603d7778c0c67d33dcfcd66e5252250109736fd65fe7a0f7895120b2' 
  AND token = '5JjHfRH7W1+w6pRyXI5h42IbTDPv9pgyCr/8FS/hfoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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