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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf14eaf3f285f72a3d869505304726a9513a9e7e1f09c3a7c79e45cac2962eda' 
  AND token = '1cBPCG+VhTkuDnXRnhSn0UQOz0HbRtpg1rXilLfvnd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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