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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fe26320f25502524b8e6c906a82c1db4c8b0ba0c95c98b9a67b6e5c7f5db8f8' 
  AND token = 'CXIBIa2aiUlTwEOKr2pJwjsUjaRQLxkPVOdjwzfVc4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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