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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c3e15f5845a1f16b9d2b02fce7c2c401fa74ae2c74fbe51c8e5cea69035d4a6' 
  AND token = 'WKgXvv2jAjHNULeAoftvQCpGJDG075XrndQZe0Al7vA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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