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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cde2aae5b14dde08fdb97a0c8c8161d70bf31d0593e2c6847a78cb39225eeb9c' 
  AND token = 'IP8T6ZKIuqWSUGcA6UubBcRaVS16ClFARx7IGDQilO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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