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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd6405115916c243dc8238672e911ae69b15f6204c7ba0a244bb6887e13f078b' 
  AND token = 'ZUQVj858VHkx65cZ0bVn9sNY6wyQgXBnknOVb5dSYdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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