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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddecdc0da86332b272878092f371ab8c9d48c071da485e27cfb25231a1602e1e' 
  AND token = '63huWRBEHl7glcTCIOOzITb5Hl53Rfm5xaoaXG/xWgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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