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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25660b2e2152f426c15c8c4e324e4fc67e5c67a18e6f7a42f121bbe727f6adbe' 
  AND token = 'T66nwkxQIv35UhsThAj8MUWD3Sfq/jc393wdVfV7rNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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