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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '879edc57c80dce04c825236c717724609786ea09441b687a1dd26bcc1e9e4eb7' 
  AND token = 'BkeXLT+I/jtGPnsxcbvnNXk02XlL0X7shWHh9l9rQgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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