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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1e82163a6bfd17a245ea8d4ff4a87e05d3047fbef77dd9a318a020a1d744c9e' 
  AND token = 'XV/8r7lV4bN9jNBoUBelk8cY08A3jfvKTHBmk3EmOw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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