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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2b943261cba763234040c7087c823e1065986d89ad4b71b51323735a436bed9' 
  AND token = '6imS8hPXkN61Yu6uL4saU42YzkcfJQfIz7ENF4w3qH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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