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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '213431b1ab3bf0974d5c7ad81cb9c01cd0d2189db3691ed36411bd4f39995c4f' 
  AND token = 'FHPAqA7N03WMl5QrjJufI6uZm1LvUkdnQQqCJlMWR8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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