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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1d28d79aab72e2f38485f6f62246a4fb019fabb148b55ce992b89c575cf9e79' 
  AND token = 'yJUqoirne4OQH8vnhxAojaHhBeqQF20vbkjFnjbPAOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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