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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04d62ba39efbd159b9ad0548e8e2a251060893040cc66df7a2f9b6faff3f9836' 
  AND token = 'VB++WEFv65pP44V4m8g78+4/MOo6wVLkQFahDgd1+10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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