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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efb225880dc36b8f2c2ed5bc432e02f4e63003bff1d7c5f60c422cf06b8abfab' 
  AND token = 'hDfLtLr6gI+agFjPN0FHXk6dJADEXiOolsXpxcH5YV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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