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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5ed2ef8bc2b51414fe5d5fc2f9e6030dce5bce91beca3b2e490ae5d5453f236' 
  AND token = 'S6/qon4osfez9DJzKJOqh3ntv578a/G2r1yW6KtN54c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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