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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '229d6def430d47b0fa587597d0c8b1e2740d87a357bd052bf4fd29ed49839de4' 
  AND token = 'Sos1jF9VXrqyanxf/80aygf0qLJUQ12MoDFq2K99X2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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