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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71ebaebd9fd14bd9f238a511995e9a453f71499af075a7b432e43e92ae6a7d9b' 
  AND token = 'PYvX4kYkHJ4wG6rMQtCX97uSVCcmY3iv6AZy680hvKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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