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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3d0e553b66771d0d563d478fa0c35dfb051d279b206aec12663ee2ef419cc7b' 
  AND token = '+0ua487QW9d41hRQjdR61S57WFoBNK0Z9stU67nxOf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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