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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f50a17299e382eb38fd3241c5eb095959d67f00584c2c1e059c317ee7c41fdc0' 
  AND token = '4EsqcpiJ/hECklccAZAfJ1jbX9khki6zUZ/PgKBmIgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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