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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd2ac59ff21b54719896f776a70f2d07c2afacf6d19c84b6f42d1100401e017b' 
  AND token = 'ZdLRBcLumLEWQQMnWt1l/9Krqir30Jb+I0o9t9th5gM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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