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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87b8018663adf53dd1081fcbeb2aa38bb20b40a32c2ce9bc10186ec03a6f4cd6' 
  AND token = 'CmgnTjRxHu3bs7IzXNODNeBedoJ+f8LibxYNmmIG9e4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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