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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b23dbb7458d79534d6ae6ad95fda807ab8f86945664138aedca5fd848077d2c8' 
  AND token = 'TfEMVFh0b5ugWDfT7OkypQPrAJlkNF/fsXiGsD8H354=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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