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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09a211b26889aa2de2b6ae46fc2e23a37642f54d358953d56ac8511545d0535b' 
  AND token = 'AunVFAgzbxFHjxjDtIQc0ALKBbukHUKBgr23yf1FpIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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