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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '950a79897436f3f794a82396f7cced6a40f7ebd158e2a10607029f999da655af' 
  AND token = '0LDD4TDePfZJ5k1wIXLemeqQHwz8E1/OZJ3ZJlZwDwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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