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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a022f0c6366ccaa6b0ab58b781445c423824dbe6b117cc32ef59fe5f7b3c59b5' 
  AND token = 'h96t2iPWe4v8wrDD7wxmSIFxKRTgBhp6JwoiVqTSTKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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