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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17ffbb9f54e302a1700ed558389d67785440ad8d6213c0e5351e87e48f78c2ae' 
  AND token = 'bKbdTn0L0GYl7mQCOVYmBnJ5+97XtY+pDs9jUlTZaOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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