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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '052faabbf0175ac5411d9e5bf18eeba2fbc3f38aa911d26a8badfb5ebb976886' 
  AND token = '7Qxzbry1LEmHY95bu+kxj4N6pBwa/7MtnnNZRXmyvW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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