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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3536bae0b57859835bd8c107af7fb81d438264e8e73bf4e3f72a84384faf8efa' 
  AND token = 'ihBP29yvVmN1KZmik84twzxpeARYyTfC6Q2T3iaFNsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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