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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9180656f6e81b84e5cde70e83023ee120bdba3dcdfbe89af39addacc0a3b8af' 
  AND token = 'WGxrC2ullY6dc5fhzqUh8u6ZwMh8vfMcufHUuAQSnao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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