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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f3b4e967afc307f6056ed22e696a9b7cfb12c78601cbbf2910a8ed39cd9fd8b' 
  AND token = 'yc/bladsBjZCdn62fP8kxMcrTsRHr12IO6pCnV46F9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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