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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c94b06d88d01838689285bec138c14a993ccb8cf2c1177d035806a4b8ded6a6c' 
  AND token = 'CzoPBY0NIq+7UuZWdiwAuJtv1C1l/BzCURKEOCstyuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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