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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dd733c9dfc30abd1a2acba6e16869922a7f60d85b066bc6d985d719f7595a32' 
  AND token = 'kU5WBlsWgLLqHOYk+zdOtSiIMdk0vRs/QnIdw4FyP2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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