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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2e13690f3b59d9fc717674d236c33c03e87a01a60ccc23c1971784ce93210fb' 
  AND token = 'Wcl9Zo3G0d6a+bRjaEy5L54BP4v9kKHy+UakK0xvX40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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