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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c652e9d306beb1add69f6d1ca3b7bffeba00cc760b156e75748fe2927f44058a' 
  AND token = 'ghF0DrDGiN6gkY2wrWp39qGtoA8J5iDGyIQciTmT/as=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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