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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cba5096a20717f7d252808ee865679b88bec20ac4674cfd64319a720aa181d59' 
  AND token = 'AObfklI9wjbMZ8H3W+FAR3MWubTCbQU6mAV6J/PGNbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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