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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f68facfb83768a9bc9ee917a10a40bb22b4e22d1ecfa8b95dea1a0923bf83dd6' 
  AND token = '2mkt9yq+TU2fHyQG0gmUOjcLlCA7MunC1KuGsWyscuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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