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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5747b3552855b45c22ad700d44376ca57be76a89a61d770bf21cb79e91de425e' 
  AND token = 'EZgwrdmQKeN4wjkZOM0L9lbCUcKOms5xZE3U0XemwKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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