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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9158c1c20b3c91a6e654370b5582b67c353e1543a000774a526a52dc0ca513f0' 
  AND token = 'vFt9Q5xx3CVowyad6e8B7lqt1jKSU085zV3shly3G28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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