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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7eb8f2529a7b3250b611fc8e327e21b0a8cd083d98739e459b4ac4661b61e170' 
  AND token = 'D//uOMUdzz/2+vEC6XzAYoGmgpMHFeA6Ky89A8ptCdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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