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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09bbaf46249195ff0e27845c6f71cc4e2ad6a5725eaeff723b3f29df29af87e4' 
  AND token = '0IuhYiZ72G85DYDLjVzxXUkDHRE1Szk9SkSq8levBP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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