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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b4fb003eaf4e25efd4d91a1643cdc2bed27c7ddb0e80f286ca7bf3dca00687b' 
  AND token = 'iW/T6GL+2qWJqhrHpeK+xQTLrxe+PfG+DlRiKPTik5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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