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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56a156cf010d9d299cd473bc9f63994c799b06dad902d6bc410b290fdc7fe3f9' 
  AND token = '5GDuxn8WkQmCedcctYLpl1BN7abagOJVlv/T8m+iaEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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