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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5185fef8461a2fc3cc5e6fb6d9808f3437804db5d7440259e6a8edb5a5357a6' 
  AND token = 'aLrh2jq8/B8cYwfN1iWwEiCsafCfMaEuz881U+LJGIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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